diff mbox series

[1/3] midx: fix broken free() in close_midx()

Message ID 9fcbbe336dffb16b7cb5f4de0163404a81597af1.1539011820.git.gitgitgadget@gmail.com (mailing list archive)
State New, archived
Headers show
Series Add GIT_TEST_MULTI_PACK_INDEX environment variable | expand

Commit Message

Philippe Blain via GitGitGadget Oct. 8, 2018, 3:17 p.m. UTC 
From: Derrick Stolee <dstolee@microsoft.com>

When closing a multi-pack-index, we intend to close each pack-file
and free the struct packed_git that represents it. However, this
line was previously freeing the array of pointers, not the
pointer itself. This leads to a double-free issue.

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
---
 midx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

Junio C Hamano Oct. 9, 2018, 9:07 a.m. UTC | #1 
"Derrick Stolee via GitGitGadget" <gitgitgadget@gmail.com> writes:

> From: Derrick Stolee <dstolee@microsoft.com>
>
> When closing a multi-pack-index, we intend to close each pack-file
> and free the struct packed_git that represents it. However, this
> line was previously freeing the array of pointers, not the
> pointer itself. This leads to a double-free issue.
>
> Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
> ---
>  midx.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/midx.c b/midx.c
> index f3e8dbc108..999717b96f 100644
> --- a/midx.c
> +++ b/midx.c
> @@ -190,7 +190,7 @@ static void close_midx(struct multi_pack_index *m)
>  	for (i = 0; i < m->num_packs; i++) {
>  		if (m->packs[i]) {
>  			close_pack(m->packs[i]);
> -			free(m->packs);
> +			free(m->packs[i]);
>  		}
>  	}
>  	FREE_AND_NULL(m->packs);

Yup, kinda obvious when we view it with the post context.
diff mbox series

Patch

diff --git a/midx.c b/midx.c
index f3e8dbc108..999717b96f 100644
--- a/midx.c
+++ b/midx.c
@@ -190,7 +190,7 @@  static void close_midx(struct multi_pack_index *m)
 	for (i = 0; i < m->num_packs; i++) {
 		if (m->packs[i]) {
 			close_pack(m->packs[i]);
-			free(m->packs);
+			free(m->packs[i]);
 		}
 	}
 	FREE_AND_NULL(m->packs);